Hydraulic system.



l. A. TILDEN.

HYDRAULIC SYSTEM.

APPLICATION FILED MAR. 7. I912.

1A,;QO Patented m 29, 1915.

JAMES A. TILPEN, OF BOSTON, MASSACHUSETTS.

I-IYDBAULIC SYSTEM.

Specification of Letters Patent.

Patented June 2%), 19115,

Application filed March 7, 1912. Serial No. 682,255.

To all 207mm it may concern:

Be it known that I, JAMES A. Times, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful. Hydraulic System, of Which the following is a specification.

In apparatus forth'c' controlling and measuring of ti uids asf' in the proportional meter of my Pai ent No. 797,027, Aug. 15, 1905, and the fireservice' system of my Patent No. 971,510, Sept. 27, 1910, it may be desir-able to divert from a main conduit through a. secondary conduit a predetermined portion of the total flow. This is conveniently accomplished by a resistance device in the form of a diaphragm provided with an opening of suitable size, such diaphragm being situated in the main conduit at the opposite side of the opening into the secondary conduit from the fluid-source. When this arrangement is employed in. connection with systems of the nature of that disclosed in my Patent No. 971,510,. previously mentioned, the user is liable to encounter the requirements ,of fire-underwriters that the main which water for extinguishing fires may be drawn, shall be practically unobstructed.

This leads to the necessity of increasing the diameter of the resistance-opening until it ceases to be effectual in diverting the desired flow. The present invention overcomes this difiiculty.

In the accompanying drawing, Figure 1 shows in top plan View one embodiment of my invention, it being applied to a proportional meter, and 2 is a central vcrtical longitudinal section therethrough.

The character A. designates a main pipe or conduit, in which is included by means of standard connections a proportional meter B. The casing of the meter comprises a main conduit-section 10 provided with inlet and outlet-pas ages 11 and 12,:respectively, equal in cross-sectional area to the corresponding normal dimension of the conduit A. Above the casingsection 10 is a chainher 13 for a tallyaneter or measuring apparatus ll. of any convenient type, this chamber furnishing a secondary conduit or by-pass having, with respect to the main conduit, an inductionopening 15 and an cduction opening 16. Between the by-pass openings is a resistance device consisting of a transverse partition or diaphragm .17, in

conduit, through which is a fixed and miobstructed opening 18 closely approximating in diameter that of the main conduit. This resistance device and the ivy-pass openings are situated in it gradually expanded portion or chamber 19 of the metercasing 10, the caliber or cross sectional area of such chamber being greater than that of the passages 11 and 12 therefore than that of the main in which. the meter is used. device lies across the chamber 19 near the outlet-passage 12, and the induction and eduction-openings of the measuring chanm her are in close proximity to the partition.

In the proportions illustrated in the drawings, or those which are necessary in practice, the resistance device would not cause such a flow to traverse the by-pass as would satisfactorily operate a commercial meter; but when the fluid enters the expanded portion 19 from the main conduit the gradual increase in area reduces its velocity, causing the kinetic energy of flow to be transformed in part into static energy, the abrupt change in direction due to the position of the in duction-opening 15 imn'iediately above the face of the diaphragm against which the current strikes augmenting this. Consequently the pressure at the opening 15 is considerably above what it is in the normal portion of the main conduit. liiorcover, the proximity of the eduction-opcning 16 to the opposite side of the diaphragm produces a negative or suction head, causing aspirating cilect. This increased pressure at the iruluction-opening 15, attributable to the eiqiandcd chamber 19 and the relation in said chamber of the opening 15 to the dial hragm, and decreased pressure at the eductilni-opening resulting, from the location of the-"opening 16 with respect to the diaphragni, added to the loss of static pressure. between the openings 15 and 16 due to the'resistancc device, leads to a measurable flow through the bypass, and it will be seen that this increase is obtained without fur-- ther obstructing the main conduit.

To show thercsults attained by my invention, it may hesaid that with a main conduit having a diameter of sin: inches, a proportional meter provided with a diaphragir opening five and one quarter inches in diameter and an expanded portion or static chamber eight inches in diameter, and as suming one thousand gallons per minute flowing, the dili'orence in pressure between As illustrated, the resistance.

dilation-opening 15, giving one and onehelf pounds differential pressure efiectiye through the measuring apparatus let. llus addition of fifty per cent. to the pressure previously available insures satisfaetory o'peretion.

I claim:

1. A proportional meter having; a section of greater caliber than the main in which Jthe'meter is used, said section provided with e diaphragm having a fixed unobstructed opening for the flow, and a by-pess around the diaphragm havine a tally-meter therein.

2. A proportional meter having standard conileotions at either end foifle ma in of fixed size and an intermediate section of greater caliber, the letter provided with a diephragm having a fixed and unobstructed opening for the flow, and e oy-pass around the diaphragm having a, tally-meter therein. 3. A proportional meter having a giradlh ally expended section of greater oeliberthen the mztiirin which the meter is used, said section provided with a a. fixed end unobstructed opening for tie flow, end a by-pess around the diaphragm having a tallyeneter therein.

Signed at Bqston in the county of Sufi folk andState of Massachusetts,' this sixth day of March 1912.

JAMES A. TILDEN. Witnesses: J

HENRY D. MINTON, FRANCIS G, HERSEY, Jr.

diaphragm leaving 

